Unified limit imporve

Registered by wangxiyuan

In Queens, Keystone exposed a batch of APIs for unified limits. These APIs are marked as experimental. In Rocky, we need to focus on the APIs' availability, stability, usability and so on.
What should be done:
1. Refactor unified limit APIs for creating and updating.
2. Expose GET /limit_model API
3. Refactor unified limit DB schema
4. A new oslo library for limit enforcement should be added as well.

Blueprint information

Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
wangxiyuan
Direction:
Needs approval
Assignee:
wangxiyuan
Definition:
New
Series goal:
None
Implementation:
Implemented
Milestone target:
None
Started by
wangxiyuan
Completed by
wangxiyuan

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